Improvement in piston-valves



UNITED STATES IMPROVE MENT lN PISTON-VALVES.

Specification forming part of Letters Patent No. 139,463. dated June 3, 1873; application filed March 13, la7-3. i

To all whom it may concern:

Be it known that I, GEORGE H. GIBBS, of Nunda, in the county of Livingston and State of' New York, have invented certainnew and usef'ul Improvements in Steam-Chest and Balance Slide-,Valve and I dohereby declare that the following is a full, clear, and exact description thereof', reference being had to the accompanying drawings and to the letters of' reference marked thereon which form a part of this specification.

The nature of my invention consists in the construction and arrangement ot' a pistonvalve to be used with steam, compressed air, or vapor, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains tornake and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawing, in which- Figure l is a longitudinal section of the chest and valve. Fig. 2 is an end view of the valve, and Fig. 3 is a perspective view of the steamchest in reduced dimensions.

A represents the steam-chest, which is of' cylindrical form, and may be cast separately or in the same piece with the cylinder, the bore of said chest being parallel with the bore of the cylinder and the chest located either above or below, or on either side of the cylinder, as required.

In the drawing, I have represented the steam-chest without heads, which are not required when the chest is used with an engine worked with copipressed air; but when steam is to be used heads must be inserted with suitable stuing-boxes for the valve-stem to pass through.

B B represent the valves on the valve-stem E. C C are the steamports, and D D the exhaust-ports, all of' which ports extend or are chambered out clear around the bore of the steam-chest, and from these chambers are extended into and out of the cylinder in suitable side-pipes cored out in the casting.

The steam is admitted into the steam-chest at G, into the cylinder at U O, and out of the steam-chest at D D. The valves B B being annular and fitting the steam-chest perfectly the pressure is alike on each, and as soon as the valves are moved to admit the steaiuat` I either port C the steam will, at'that time, entirely surround the valve,- and thepressure is alike on all sides. t

ln this arrangement it isonly necessary t0 pack against exhaust steam at the front head, and the back head will be closed.

The valves may be made solid or in any manner to insure a perfect joint.

In the drawing, I have shown themcon#` strncted in the tollowingmanner `a is a metal ring, made tapering at both ends, and after it is turned out the washers b b are turned to fit, J Vas shown.

The ring a is then cut into` sections, as represented in Fig. 2, and then fastened together and a split ring, d, cast around them. By screwing up the nuts f f the washt ers J J are brought together, which forces the sections of' the ring a outwardly and expands the ring d. The nuts ff, besides expanding the valves, are used to adjust the valves on the valve-stem E.

When used for compressed airpno headsare V required and noexhaust side pipes or ports.

It will readily be-seeu that by this arrangement of' parts the valves, whether solid or y otherwise, are perfectly and accurately balanced.

The steam-ports C C being located on the ,l

inside of' the exhaust-ports D D, I am enabled to very materially shorten the valve, reduce the friction, and gain a much more free exhaust than can be obtained in the old manner also, the ports extending entirely around l` thesteamchest, thereby gaininga great length t l of port in a convenient and very desirable manner.

With this style of' valve and steam-chest 5 the parts are less` liable to wear by use, as l. there is no pressure and but little bearing y surface presented, and that is the` face ofthe ring d, which, when worn, may be easily replaced and does not require turning.

The valve has a very short travel when coml PATEivTNQrFIoE.

Having thus fully aesribea my invention,

what I claim as new, and desire to secure by Lett-ers Patent, is-

The valve B, constructed as described of the sectional ring a tapering at both ends, washers b b, and split exterior ring d, in combination with the nuts ff, substantially as and for the purposes herein set forth.

lx1 testimony thetlI claim the foregoing as my own yI afx my s'gnature in presence of t o witnesses.

GEORGE H. GIBBS. Witnesses:

UTLEY SPENCER,

J. B. SATTERLEE. 

